Just wondering how the White House and other secure sites deal with remote control airplanes and drones? I know the payload on even some of the biggest remote control airplanes can be as much as 15 pounds, but 15 pounds of explosives can be quite deadly. How come there has not been any terrorist attacks using remote control airplanes or drones? Both are easy to purchase and fly? Just wondering what type of high level electronics they use to thwart these type of attacks.